MEDINA, OH – RPM International Inc.’s Tremco business has acquired Schul International Co. LLC, a manufacturer of joint sealants for commercial construction, and Willseal LLC, a business that markets and sells Schul products. Both companies are headquartered in Hudson, New Hampshire, and have combined annual net sales of approximately $15 million. Terms of the transaction were not disclosed.

Schul’s product line primarily consists of pre-compressed, self-expanding foam tapes, which are used for sealing vertical and horizontal joints in applications that include window seals, precast concrete, modular construction and concrete façade restoration. They are sold under the Sealtite and Willseal brands. 

Schul is an industry innovator that has developed a number of proprietary systems, including those that are fire rated to provide passive fire protection and others that are pre-coated with silicone to deliver weather-tight joints. Its systems are further differentiated by the use of monolithic foam versus competing products that are made from several foam layers that are laminated together.

Schul and Willseal will be integrated into RPM’s Tremco Commercial Sealants & Waterproofing business, which specializes in the manufacture of sealants and waterproofing products for commercial, residential, industrial and infrastructure markets. The companies’ leaders, Steve Robinson of Schul and Brian Iske of Willseal, will continue in their current roles with the business units as part of Tremco.